Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b586713f8ce84d2…

MALICIOUS

PDF

76.9 KB Created: 2021-06-11 20:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 91759405980a60b3263840adc0d610d4 SHA-1: 703a92a9d97b64a0cc8b623b151a59ad6c1a3c1c SHA-256: 1b586713f8ce84d234c00edf303d5ee1333b2eb6d205cf40f22746421cb6f30a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm hosted on multiple compromised WordPress sites, designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=yin+2003+case+study+research+design+and+methods+pdf PDF link annotation
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607280809def5---fuzin.pdfIn PDF document text
    • http://artospace.com/pics/file/zewiluxogawitulavidafate.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/17cd41de972ba89823c092ffd85b8142/xufibagej.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6013c72f151b77e89fd324d0ffed1e39/bapafig.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/wewogugas.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9a2neb4km2jl9ks0kos9251o64/sutokopuxenev.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082312aefa7b---dugijajixi.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/tilerug.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/tj0h5kfd7l69iqfo5i3np1rvk7/judip.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609162fdd3ccb---dojematojojazimofubin.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0638ed99ce25fd4906fc0b641a9656c8/33743902126.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6caf3893dc---gakorunine.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6d3b9e76201eca06d75bfc04e1edd68c/15181382675.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/54762022254.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/50oni91e4k1a94a3e0vcvltah9/paxobosazugemukutijum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 5920 bytes
SHA-256: ec416e3178edad12cb75e10060c4f9e51932a528bde1dc692e092cd088711343
font_01_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 10676 bytes
SHA-256: a80c49ede9fa0aba59531edf7876956a4334a28aaec427822e3a8d9cae0f34cf
font_02_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f